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- PostgreSQL database opens up to Windows
- PostgreSQL database opens up to Windowsarticle rootOpen databases: Which is best?MySQL and PostgreSQL are noteably the most mature of the open source databases.They are not, however, equivalent in terms of their performance under specific database designs.Just as the major commercial closed source databases have their preferred applications where their performance...
- Tags: database, Microsoft Windows, MySQL, netgk5815, PostgreSQL
- Discussion threads 2005-04-07
- A great book about RF circuit design just got better
- Christopher Bowick and his book RF Circuit Design have been helping people understand the intricacies of RF design for almost 25 years. Well, Mr. Bowick has stepped it up a notch by creating a second edition with new information. The following synopsis of the book mentions the new areas covered...
- Tags: Noise Figure, Noise Factor, Wi-Fi, Wireless, Bluetooth, Michael Kassner
- Blog posts 2008-03-24
- Erratic Noise Margin on DSL line
- The quick run-down is:We've had problems with the DSL during certain parts of the year where the Noise Margin keeps going really low (-1) and this then causes the CRC errors to add up very quickly up to 30,000 sometimes before the router finally restarts itself. Very recently (last 2...
- Tags: cable, DSL, DSL-line, Tink!, router
- Q&A 2006-02-10
- Fight intermittent disconnections with NetStumbler
- Most of us have experienced the tribulations of an intermittent wireless connection. Frustrations set in fast when a pop-up informs you that you're no longer connected, especially during a large file transfer or when you're streaming a movie. You can troubleshoot a weak signal or interference by determining the limitation...
- Tags: Wi-Fi, WIRELESS, Wireless LANs, Cellular phones, NetStumbler, WAP
- Blog posts 2007-07-30
- Digital Transmission: Carrier-To-Noise, Signal-To-Noise & Modulation Error Ratio
- This paper provides a background on several signal quality metrics applicable to CMTS and cable network operation and how they relate to overall performance. The CMTS upstream SNR and cable modem or STB downstream SNR estimates are explained. Noise, as discussed in this paper and unless defined otherwise, refers to...
- Tags: Cable Network, Noise, Cable, Network Technology, Tv & Home Theater, Telecommunications, Personal Technology, Networking
- White papers 2006-11-01
- A Reduced Complexity Channel Estimation for OFDM Systems With Precoding and Transmit Diversity in Mobile Wireless Channels
- A precoding approach for reduced complexity channel estimation for OFDM systems with transmit diversity is presented. Two different OFDM schemes that employ the precoding are investigated: the first one is based on space-time coding, the second is based on a transmit diversity using an optimal design of symbols for channel...
- Tags: Mobile, Diversity, University Of Victoria, Channel Estimation, OFDM, Wireless
- White papers 2006-02-07
- wireless site surveys
- I am contemplating buying Air Magnets Air survey pro. Does anybody have any expeirence with this or related products? I will be starting the expansion of my business, hopefully first quarter of 2009, to provided wireless internet service for apt. complexes,etc. you get the idea.Airmagnet is overpriced!!!The question comes down...
- Tags: Marketing research, AirMagnet Inc., survey, Symbol Site Survey
- Discussion threads 2008-03-02
- Experimental Evaluation of Adaptive Modulation and Coding in MIMO WiMAX With Limited Feedback
- This paper evaluates the throughput performance of an OFDM WiMAX (IEEE 802.16-2004, Section 8.3) transmission system with Adaptive Modulation and Coding AMC by outdoor measurements. The standard compliant AMC utilizes a 3-bit feedback for SISO and Alamouti coded MIMO transmissions. By applying a 6-bit feedback and spatial multiplexing with individual...
- Tags: Measurement, MIMO, Transmission, Hindawi Publishing, AMC, Performance Management, OFDM, WiMAX, Wireless And Mobility, Human Resources, Workforce Management
- White papers 2007-11-28
- Performance Evaluation of WiMAX System Using Convolutional Product Code (CPC)
- The WIMAX technology based on air interface standard 802-16 wireless MAN is configured in the same way as a traditional cellular network with base stations using point to multipoint architecture to drive a service over a radius up to several kilometers. The range and the Non Line of Sight NLOS...
- Tags: Performance, Performance Evaluation, Convolutional Product Code, WiMAX, Wi-Fi, Wireless And Mobility
- White papers 2008-11-26
- WiFi DHCP / Connectivity Issues
- WiFi DHCP / Connectivity IssuesOkay I've been battling this Wi-Fi problem here at work and I thought I'd type it up and see if any of you could help me out.Where I work, we have a warehouse area with an automation system & conveyor belt, as well as an administrative...
- Tags: AP, Associated Press, DHCP, Genphlux, IP, linksys wap54g, network, networking, server, Wi-Fi, wireless
- Discussion threads 2005-08-22
- Cybercops drowning in data
- 2 Problems: $ and Real NeedUsually, it takes a real need to get the $.The first thing is that most of that data isn't necessary to prove crimes that are already under investigation. Simple basic police work is usually good enough for that.What the feds want is the ability to...
- Tags: tomb@...
- Discussion threads 2007-03-01
- Microsoft to blast Google over copyrights
- snr.thanks for your attention"Companies that create no content of their own, and make money solely on..."Companies that create no content of their own, and make money solely on the backs of other people's content, are raking in billions through advertising revenue and IPOs," What a bunch of assinine hipocrites those...
- Tags: Google Inc., Microsoft Corp., agripino1927@..., windows, security, software, hardware, programming, e-mail
- Discussion threads 2007-03-06
- Michael herid snr is pain in the butt !
- this guy is a complete ostrich when it comes to discussing topics.Do we need to explainPlease agree so we can send a message home to him.
- Tags: gsaravin@...
- Discussion threads 2007-03-12
- Photos: Pictures that lie
- Bush Sr. and ThatcherSome years ago, the cover of Scientific American had carried a photo of George Bush Sr. and Margaret Thatcher, walking hand-in-hand. In reality, they were in fact just walking side-by-side. This was purportedly done to highlight the then-emerging field of digital image manipulation, as explained in an...
- Tags: gfhavewala@..., photograph, plush toy
- Discussion threads 2007-06-26
- IT pros seek advice on how to dump a dead-end job
- One IT professional wonders if he should leave an IT post that offers no mobility to become a consultant; another wants to know how she can balance family obligations and job hunting. Here are the answers from a professional business coach.Let professional business coach Karen Childress help answer your career...
- Tags: Recruitment & Selection, Professional development, Workforce management, Karen Childress, job, career, information technology
- Technical articles 2001-05-30
- On the Optimality of the OFDMA Network
- This paper studies the optimality of the OFDMA network. It is proved that in the multiuser multicarrier downlink system with independent decoding, OFDMA is the optimal multiple access scheme. It is also shown that the optimality of OFDMA holds for any adaptive modulation scheme whose Rate-SNR/SINR function can be approximated...
- Tags: OFDMA
- White papers 2004-07-15
- Innovations in Wireless Broadband Technologies
- This paper presents innovations related to the use of OFDM/OFDMA in IEEE 802.16 as well as ETSI HiperMAN standards. The paper addresses the last innovations in standards, related to channel estimation in high delay-spread environments, carrier allocation for optimal cell range extension and better frequency reuse when using OFDMA, SNR...
- Tags: Innovation, Alvarion Ltd., Broadband, OFDMA, Wireless Broadband, Leadership, OFDM, Strategy, Wireless, Management
- White papers 2004-12-08
- MIMO in 3G Cellular Systems: Challenges and Future Directions
- The multidimensional MIMO channel can be exploited to increase the diversity of the system or to provide parallel spatial channels, which is known as spatial multiplexing. Diversity is generally considered lower risk, and a well-known example is space-time codes, which have found adoption in 3G CDMA cellular systems. Diversity increases...
- Tags: MIMO, Diversity, IEEE, 3G, Cellular Phones, Wireless, Consumer Electronics, Personal Technology
- White papers 2005-04-29
- Fast 802.11 Link Adaptation for Real-Time Video Streaming by Cross-Layer Signaling
- The quality of real-time video streaming over wireless links is significantly reduced due to packet losses and delays caused by rapid changes of the link conditions. This problem is resolved by two solutions. In the first place, a responsive MAC adaptation method is developed using SNR and packet loss statistics....
- Tags: IEEE 802.11, MAC, Streaming Video, Video, Web Site Development, Web Technology, Digital Video, Corporate Communications, Wireless LANs, Wireless, Internet, Personal Technology, Marketing
- White papers 2005-02-08
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